State of the art earphones designClear high and low volumeWireless and convenient: Bluetooth 4.1 makes the true wireless stereo mini headphones extraordinaryOnly power on/off to control upto 30ft Bluetooth range in the open space

Bluetooth version: v4.1 + Edr frequency response : 20hz - 20khz effective range: 10 meters(open area) working time: music: ~2.5 Hours; talk: ~3 hours standby time: ~ 400 hours input time: dc: 5v/500mah charging time: ~3 hours cpu: 128mhz. Audio decoding ability: 24bits audio-decoder snr: -98db charging cradle battery capacity: 480ma charing voltage: 3.7V noise reduction: yes highlight: 1. You can use the both earphone at the same time, to enjoy left and right stereo sound. 2. Also you can use right and left earphone separately, as it can connect to two different Bluetooth devices. 3. The charging case can be used as a power bank. 4. Mini comfortable design. How to connect1,Turn on the power button to the left, the LED indicate red, it means the earbuds are in charging statue. It will power off when full charged and the red LED tunes off. 2,Turn on the power button to the right, the blue LED will flash in 5-7 seconds, and then one of them will flash between red and blue, it means it is in pairing model. At this time,you can pair it in your device. When it paired, the blue LED will flash. Note: when it is in pairing model, but not connected, it will turn off in 2 minutes. 3,When it connected successfully first time, it will connected automatically next time. Note: when make phone call, only one earphone will work, which makes you know all thing around. 4,They can be used separately. The way is the same as above. If you still can not use it after that, please contact bulls, we will helpyou package include: 2 x true wireless stereo earbuds 1x charging station with relief cover 1xcharging cable.